Blood Nova

This spell causes an explosion of cursed blood out from the caster. When the spell is cast, you sacrifice 3d4 hit points to create an explosion of your own, now cursed blood around you in a 30 foot area, dealing 6d8 necrotic damage to all creatures of your choice within that area who fail a dexterity saving throw, only taking half damage on a success, and healing you and any minions that are under your control via other necromancy spells for 1d4 hit points for every creature hit by the spell who fails their dex save.